High-density information storage media

Abstract

A high-density information storage medium has a shorter length of information bits and a smaller pitch of track. The storage capacity is increased by shortening the track pitch and data bit length and increasing the storage density. The medium of the invention can be made by current CD manufacturing facilities, and can be read through general DVD devices.

What is claimed is:  
     
         1 . A high-density information storage medium, comprising 
 a substrate having information recorded thereon; and    a plurality of pit trains formed on said substrate at a specified track pitch; said track pitch is set from 0.61 to 0.67 micrometer.    
     
     
         2 . A high-density information storage medium according to  claim 1  wherein said pit trains is formed with a plurality of pits each having a minimum length of 0.28 to 0.47 micrometer.  
     
     
         3 . A high-density information storage medium according to  claim 1  wherein said pit trains is formed with a plurality of pits each having an optimal minimum length of 0.4 micrometer.  
     
     
         4 . A high-density information storage medium according to  claim 1  wherein said track pitch is set at 0.64 micrometer.  
     
     
         5 . A high-density information storage medium according to  claim 1  wherein said medium having at least a recording layer.  
     
     
         6 . A high-density information storage medium according to  claim 1  wherein said medium utilizing {fraction (8/15)} modulation to shorten the length of a data bit.  
     
     
         7 . A high-density information storage medium according to  claim 1  wherein said medium incorporating techniques of error correction code.  
     
     
         8 . A high-density optical disc, comprising 
 a substrate having information recorded thereon; and    a plurality of pit trains formed on said substrate at a specified track pitch; said track pitch is set from 0.61 to 0.67 micrometer.    
     
     
         9 . A high-density optical disc according to  claim 8  wherein said pit trains is formed with a plurality of pits each having a minimum length of 0.28 to 0.47 micrometer.  
     
     
         10 . A high-density optical disc according to  claim 8  wherein said pit trains is formed with a plurality of pits each having an optimal minimum length of 0.4 micrometer.  
     
     
         11 . A high-density optical disc according to  claim 8  wherein said track pitch is set at 0.64 micrometer.  
     
     
         12 . A high-density optical disc according to  claim 8  wherein said disc having a diameter chosen from 80 and 120 millimeter and having a variance of diameter less than 5%.  
     
     
         13 . A high-density optical disc according to  claim 8  wherein said disc having a recording layer.  
     
     
         14 . A high-density optical disc according to  claim 8  wherein said disc having at least a recording layer and at least a reflecting layer so as to form a multi-layer optical disc.  
     
     
         15 . A high-density optical disc according to  claim 8  wherein said disc having at least a recording layer and at least a reflecting layer so as to form a double-side optical disc.  
     
     
         16 . A high-density optical disc according to  claim 8  wherein said disc utilizing {fraction (8/15)} modulation to shorten the length of a data bit.  
     
     
         17 . A high-density optical disc according to  claim 8  wherein said disc incorporating techniques of error correction code.